Soil water index approach for landslide disaster assessment in Sabah
Landslide disaster assessment and management have become challenging concerns in recent years. Hence, this paper has been written to study on Soil Water Index (SWI) approach for landslide disaster assessment at three different regions in Sabah which are Ranau, Tambunan and Sandakan. Landslide is des...
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| Format: | Academic Exercise |
| Language: | English English |
| Published: |
2022
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| Online Access: | https://eprints.ums.edu.my/id/eprint/35185/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/35185/2/FULLTEXT.pdf |
| Summary: | Landslide disaster assessment and management have become challenging concerns in recent years. Hence, this paper has been written to study on Soil Water Index (SWI) approach for landslide disaster assessment at three different regions in Sabah which are Ranau, Tambunan and Sandakan. Landslide is described as a mass of rock, rubble, or soil moving down a slope under the force of gravity. Landslides are influenced by different variables which are the factors that contribute to landslides (e.g., design errors, construction errors, maintenance errors, geological features and human causes) as well as the factors that triggered the landslides (e.g., earthquake and rainfall). Hence, the objective of this project is to study the landslide cases and rainfall data in the three regions chosen in Sabah. Second objective is to calculate the SWI associated with the landslide events. Third objective is to analyse the effect of rainfall on landslide events based on the SWI method. The SWI is equivalent to the total storage volume of the tank model, where rainfall is utilized as an input to create outputs such as surface runoff, subsurface flow, intermediate flow, and sub-base flow, as well as infiltration, percolation, and water storage in the tank. The critical SWI of each site is computed based on the landslide incidences and rainfall data from the three regions analysed, with a high level of SWI suggesting that rainfall plays a considerable role in destabilizing the slope. Thus, more detailed scientific study of the connection between rainfall events and landslide occurrences in Sabah is necessary for landslide disaster assessment. |
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